Why Khushi decided on OTT behavior in the first place: Khushi tried to get him to spill the beans by asking him several times why he married her...she even left home before he blackmailed her into coming back..now she can ask him again and again but we all know he isn't spilling the beans anytime soon..khushi had realized that..she knows another heartbreak is awaiting her at the end of six months...she knows both her and his families will question her again...perhaps she is trying to lessen the blow by trying to get him to kick her out sooner...so she started to annoy him intentionally through her OTT behaviour
Why Khushi is back to her Swami act again: When Arnav told her he pretended to faint because of her loving wife act, she realized that she had some success by displaying OTT behavior that her questioning him didn't...she thought that she could achieve her mission..so she will intentionally act stupid and annoy him to get what she wants..
So relax people..Khushi isn't stupid..nor is her character being butchered..she is intentionally doing those stupid things to break Arnav..
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